A single cashier is able to serve 15 customers per hour at a store checkout. An average of 9 customers arrive at the checkout each hour to be served. What is the probability it will take longer than 7 minutes to serve a customer at the checkout? 0.021160.01490 approximately 0 0.1738 0.2466 0.3932 Clay is heading to the store checkout. What is the probability that he will find customers waiting in line (one or more in the line)? 0.76 0.44 0.36 0.56 0.53